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MCP23017-E/ML Datasheet(PDF) 19 Page - Microchip Technology

Part # MCP23017-E/ML
Description  16-Bit I/O Expander with Serial Interface
PDF  42 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP23017-E/ML Datasheet(HTML) 19 Page - Microchip Technology

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 2005-2016 Microchip Technology Inc.
DS20001952C-page 19
MCP23017/MCP23S17
3.5.3
INTERRUPT-ON-CHANGE
CONTROL REGISTER
The
GPINTEN
register
controls
the
interrupt-on-change feature for each pin.
If a bit is set, the corresponding pin is enabled for
interrupt-on-change.
The
DEFVAL
and
INTCON
registers must also be configured if any pins are
enabled for interrupt-on-change.
3.5.4
DEFAULT COMPARE REGISTER
FOR INTERRUPT-ON-CHANGE
The default comparison value is configured in the
DEFVAL register. If enabled (via GPINTEN and
INTCON) to compare against the DEFVAL register, an
opposite value on the associated pin will cause an
interrupt to occur.
REGISTER 3-3:
GPINTEN: INTERRUPT-ON-CHANGE PINS (ADDR 0x02) (Note 1)
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
GPINT7
GPINT6
GPINT5
GPINT4
GPINT3
GPINT2
GPINT1
GPINT0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-0
GPINT<7:0>: General purpose I/O interrupt-on-change bits <7:0>
1
= Enables GPIO input pin for interrupt-on-change event.
0
= Disables GPIO input pin for interrupt-on-change event.
Note 1:
Refer to INTCON.
REGISTER 3-4:
DEFVAL: DEFAULT VALUE REGISTER (ADDR 0x03)
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
DEF7
DEF6
DEF5
DEF4
DEF3
DEF2
DEF1
DEF0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-0
DEF<7:0>: Sets the compare value for pins configured for interrupt-on-change from defaults <7:0>
(Note 1)
If the associated pin level is the opposite from the register bit, an interrupt occurs. (Note 2)
Note 1:
Refer to INTCON.
2:
Refer to INTCON and GPINTEN.



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